December weather forecast
Coyolar, Costa Rica

December, the first month of the winter in Coyolar, is still a warm month, with an average temperature fluctuating between 29.7°C (85.5°F) and 22.1°C (71.8°F).

Temperature

Coyolar commences December with an average high-temperature of a still moderately hot 29.7°C (85.5°F), maintaining a close resemblance to the previous month. During December, the temperature tends to dip to an average of 22.1°C (71.8°F) at night.

Heat index

Throughout December, the heat index is calculated to be a very hot 35°C (95°F). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', determines the feeling of heat when you account for the relative humidity. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in December is 75%.

Rainfall

In Coyolar, in December, it is raining for 10.8 days, with typically 19mm (0.75") of accumulated precipitation. Throughout the year, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

The month with the shortest days in Coyolar is December, with an average of 11h and 36min of daylight.
On the first day of December in Coyolar, sunrise is at 05:39 and sunset at 17:15. On the last day of the month, sunrise is at 05:54 and sunset at 17:28 CST.

Sunshine

In December, the average sunshine in Coyolar is 9.6h.

UV index

The months with the highest UV index are January through September and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in December interprets into the following advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.